Disk harrow construction



Oct. 31, 1939. E. SMITH DISK HARROW CONSTRUCTION Filed Dec. 6, 1937 Izzz/zztor Lewz'sE5mz't/z Patented Oct. 31, 1939 I FATE-NT OFFICE.;T"

' 2,178,052 msx HARROW CONSTRUCTION Lewis E. Smith, Auburn, N. Y., assignor to International Harvester Company, a corporation of New Jersey Application December 6, 1937, Serial No. 178,253

'7 Claims.

This invention relates to a disk harrow construction. More specifically it relates to a control disk and extension sleeve therefor for an end disk of a harrow gang, which will limit the 5 amount of soil moved by this disk.

In the use of a harrow comprising a gang of harrow disks mounted on a common shaft, it has been found desirable to limit the amount of soil moved by the harrow disk. By limiting the amount of soil moved by the end disk, it is possible to eliminate almost entirely the ridge commonly left by this disk.

The principal object of the invention is to provide means for eliminating ridges ordinarily left by the end disk.

Another object of the invention is the provision of means which will effect a reduction in the depth of cut by an end disk of a harrow gang.

A further object is to provide means which may be secured to the end disk of a harrow gang for the reduction of the depth of cut and amount of soil moved by the end disk.

Another object is the provision of a control disk which may be fastened to the end disk of a harrow gang.

A further object is to provide an extension sleeve and cap for securing a control disk to an end disk of a harrow gang.

Other objects will appear as the disclosure is more fully made.

According to the present invention, a control disk of concave-convex shape is secured to the concave face of the end disk of the harrow gang, which has its concave face toward the outside of the gang. An extension sleeve is secured to the end of the harrow shaft, and upon this sleeve is mounted a cap for securing the control disk against the end harrow disk.

In the drawing, the figure shows a section taken through the end of a disk harrow.

A shaft Ill carries harrow disks ll of concavoconvex shape, of which the end disk on the concave end of the gang and the adjacent disk are shown. Spacing spools I2 separate the disks and an end collar l3 retains the outer disk II. The

end of the shaft Ill is threaded as at l4 and receives an extension sleeve l5, which is externally threaded. A control disk 16, also of concavoconvex shape but of smaller diameter than the outer disk H, is positioned over the extension sleeve, so as to abut the outer disk with the concave side of the disks facing one another. A cap ll is threaded over the end of the extension sleeve and retains the control disk against the outer disk ll. Its position on the extcDSion sleeve may be fixed by means of a set screw l8.

By this arrangement of parts, it will be seen that, in operation, the outer disk II will not move as much soil as the remaining disks. It is of special advantage to employ the extension sleeve in a case where the shaft does not extend far enough beyond'the outer disk to permit the use of a retaining collar for holding the control disk.

It will be apparent that changes maybe made in the above construction without departure from the spirit of the invention.

It is intended to limit the invention only within the terms of the appended claims.

What is claimed is:

1. A harrow construction comprising a shaft, a concave-convex harrow disk mounted near one end thereof with its concave side toward that end, a collar carried by the disk shaft abutting the concave side of the disk, a sleeve in threaded engagement with the end of the shaft and abutting the collar, a concavo-convex control disk positioned over the end of the shaft and abutting on its concave side the concave side of the harrow disk, and a cap in threaded engagement with the sleeve and holding the closure disk against the harrow disk.

2. A harrow construction comprising a shaft, a concavo-convex harrow disk mounted on the shaft adjacent one end thereof with its concave side toward that end, a collar carried by the shaft abutting the concave side of the disk, a sleeve secured to the end of the shaft and abutting the collar, a concavo-convex control disk positioned over the end of the shaft andabutting on its concave side the concave side of the harrow disk, and a cap secured to the sleeve and holding the closure disk against the harrow disk.

3. A harrow construction comprising a shaft, a concavo-convex harrow disk mounted on the shaft adjacent one end thereof with its concave side toward that end, a concavo-convex control disk positioned against the harrow disk with its concave side toward the concave side of the harrow disk and extending beyond the end of the shaft, and means connected to the end of the shaft for holding the control disk'against the harrow disk.

4. A harrow construction comprising a shaft, a harrow disk mounted on the shaft adjacent one end thereof, a control disk held against the harrow disk beyond the end of the shaft, and means connectedto the end of the shaft for holding the control disk against the harrow disk.

5. A harrow construction comprising a shaft, a harrow disk mounted on the shaft adjacent one end thereof, an extension sleeve secured to the end of the shaft, and a control disk mounted on the extension sleeve and abutting the harrow disk.

6. A harrow construction comprising a shaft, a harrow disk mounted on the shaft adjacent one end thereof, an extension sleeve secured to the end of the shaft, a control disk positioned over the sleeve against the harrow disk, and a cap member secured to the extension sleeve and holding the 10 closure disk against the harrow disk.

7. A harrow construction comprising a shaft, a concavo-convex harrow disk mounted on the shaft adjacent one end thereof with its concave side toward that end, an extension sleeve secured to the end of the shaft, a concavo-convex control disk mounted on the extension sleeve with its concave side against the harrow disk, and a cap secured to the extension sleeve and holding the closure disk against the harrow disk.

LEWIS E. SMITH. 

